How do I register a custom IObjectRenderer in log4net?

Question

I\'m doing some research into using log4net, and I found the IObjectRenderer interface interesting. It would allow us to control how types are logged and provide a

Answer 1

You can also add this line to the root of your log4net if you don't want to register your renderer programatically

<renderer renderingClass="ConsoleApplication1.FooRenderer" renderedClass="ConsoleApplication1.Foo" />

Answer 2

I poked around with it some while writing the question and came up with this:

using System.IO;
using log4net;
using log4net.Config;
using log4net.ObjectRenderer;
using log4net.Util;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            BasicConfigurator.Configure();

            ILog log = LogManager.GetLogger(typeof(Program));
            var repo = LogManager.GetRepository();
            repo.RendererMap.Put(typeof(Foo), new FooRenderer());

            var fooInstance = new Foo() { Name = "Test Foo" };
            log.Info(fooInstance);
        }
    }

    internal class Foo
    {
        public string Name { get; set; }
    }

    internal class FooRenderer : log4net.ObjectRenderer.IObjectRenderer
    {
        public void RenderObject(RendererMap rendererMap, object obj, TextWriter writer)
        {
            if (obj == null)
            {
                writer.Write(SystemInfo.NullText);
            }

            var fooInstance = obj as Foo;
            if (fooInstance != null)
            {
                writer.Write("", fooInstance.Name);
            }
            else
            {
                writer.Write(SystemInfo.NullText);
            }
        }
    }
}

I am not certain if this is the correct way to do this, but I do know that it worked.